To find out exactly what mime to type for the uploader extensions, it is best to find out what mime type is being detected by your server.
Here is the new link to the updated test script: mime test script version 4
Here is the way it works: The idea of the test script is to find out what functions work with your server, and to see what mime types they detect on your system. So, if you plan on uploading only mp3 files, then what you do is ftp to your site and place an mp3 file and the test script file in a folder, and then run the test script. That will tell you exactly what is being detected. Then you will know exactly what mime types to specify in the "Permitted MIME types" in the Plug-in or Module Manager.